Stripe billing option request: Value based + Usage based

Having the retainer on top of the Value based for some client feels expensive. Whereas having the usage based + Value based insures for us to get back exactly what it cost in min per call and only get profits from the value based.

To summarize : Clients would prefer an offer 0.10 cents per min of call + 100 Euro per booking VS 200/300 Euro per month + 100 Euro per booking